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Reports unresolved references injected by
<a href="https://www.jetbrains.com/help/idea/using-language-injections.html">Language Injections</a>.
<p>Example:</p>
<pre><code lang="java">
    @Language("file-reference")
    String fileName = "/home/user/nonexistent.file"; // highlighted if file doesn't exist
</code></pre>
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